CN107476947B - Cam-driven fluid power device - Google Patents
Cam-driven fluid power device Download PDFInfo
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- CN107476947B CN107476947B CN201710915916.3A CN201710915916A CN107476947B CN 107476947 B CN107476947 B CN 107476947B CN 201710915916 A CN201710915916 A CN 201710915916A CN 107476947 B CN107476947 B CN 107476947B
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- reciprocating
- screw
- guide
- cam
- guide shaft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
- F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
- F04B9/042—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being cams
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Transmission Devices (AREA)
- Reciprocating Pumps (AREA)
Abstract
The invention discloses a cam-driven fluid power device, which comprises a reciprocating screw in a reciprocating mechanism, wherein the reciprocating screw is provided with a guide groove on the cylindrical surface of a shaft, the guide groove is in sliding fit with a screw slide block, the reciprocating motion of the screw slide block is driven by the rotation of the reciprocating screw, the longitudinal section of the screw slide block is of a T-shaped structure, a vertical block of the T-shaped structure is in sliding fit with the guide groove, a transverse block of the T-shaped structure is in movable fit connection with a screw nut, one side of the screw nut is connected with one end of a piston rod through a connecting rod, the other end of the piston rod is matched with a cylinder body through a piston, and the cylinder body is provided with a fluid inlet and a fluid outlet; two ends of the reciprocating screw rod are respectively supported on the frame, and one end of the reciprocating screw rod is connected with the power source through the transmission part. The device is directly realized by utilizing a mechanical structure, and can transmit the power of a power source to a reciprocating mechanism through a transmission mechanism and then drive a pump set piston rod to reciprocate, so that the pumping wire of fluid is realized.
Description
Technical Field
The invention relates to the technical field of fluid driving equipment, in particular to a cam driving type fluid power device.
Background
The reciprocating mechanism is widely applied to compressors, engines and various fluid pumps, and is in the most typical form of a crank-link reciprocating mechanism, and mainly comprises a crank, a link, a piston or a slide block and the like, wherein one end of the link is in rotary fit with the crank, and the other end of the link is in rotary fit with the piston or the slide block, so that the conversion of the rotary motion of the crank and the reciprocating motion of the piston or the slide block is realized. It is known that the connecting rod of a conventional crank-connecting rod mechanism operates in a swinging motion, so that the force exerted by the connecting rod on the piston is a swinging force, which, needless to say, will cause the piston to slap against the cylinder, causing noise, and causing the piston to generate a larger side pressure against the cylinder, increasing friction losses. In order to overcome the above drawbacks of the conventional crank-link mechanism, a mechanism for driving a piston or a slider in a straight reciprocating manner is sought, wherein a scheme of a straight reciprocating mechanism in the prior art is shown in fig. 1 and 2, wherein the mechanism comprises a pair of gears 1 and 2 which are identical in size and mutually meshed and opposite in rotation, handle pins 11 and 22 are arranged on the two gears 1 and 2 in a mirror symmetry manner, a reciprocating frame 3 is additionally arranged, a long straight guide groove 33 is formed on the reciprocating frame 3, two guide rails A, B which are parallel to each other are arranged on the guide groove 33, and the handle pins 11 and 22 are simultaneously inserted into the guide groove 33 and matched with the guide rails A, B, or the handle pins 11 and 22 are matched with the guide rails A, B after being sleeved with rollers 4; a piston or slide 5 is additionally provided and connected to the reciprocating frame 3 by a guide rod 6, the piston or slide 5 being in sliding engagement with a cylinder 7. When the gears 1, 2 are engaged and rotated, the pins 11, 22 will directly or indirectly act on the guide rail A, B of the guide groove 33 and thus drive the reciprocating frame 3 to move, and it is easy to see that the reciprocating frame 3 must reciprocate linearly due to symmetry, and the piston or slide 5 must reciprocate linearly. However, it has been found in practice that the above-mentioned linear reciprocating mechanism has a need for improvement, which is mainly represented by: 1) Firstly, the matching clearance between the guide rail A, B and the handle pins 11, 22 or the roller 4 is in awkward condition, if the matching clearance is too small, the handle pins 11, 22 or the roller 4 can easily contact the two guide rails A, B at the same time, and as a result, the two guide rails roll smoothly to increase friction loss, and if the matching clearance is too large, the two guide rails can generate great impact noise in reciprocating motion; 2) Secondly, the reciprocating motion of the reciprocating frame 3 and the piston or slide 5 necessarily presents a reciprocating inertial force, which is known to be one of the main causes of the vibration noise generated by the mechanism; 3) Finally, the straight guide groove 33 and the guide rail A, B can only make the piston or the slide block 5 obtain a single movement mode such as simple harmonic movement, but cannot obtain certain specific movement rules according to requirements, for example, the compressor needs to control the piston 5 to move slowly to reduce exhaust burst noise during the compression and exhaust stroke, and needs to control the piston 5 to move faster to improve the working efficiency during the intake stroke.
At present, some reciprocating motion products realize reciprocating motion through a travel limit switch or changing the power output direction of a power source, and the products are relatively complex in control and structure and high in manufacturing and maintenance cost.
The reciprocating mechanism is realized through the travel limit switch, and the limit switch is loose and fails to cause high failure rate and poor reliability due to frequent system action times.
The mode of changing the power output direction of the power source to realize reciprocating motion needs to be realized by combining a control system with a driving system, the input cost is high, and the defects of poor reliability still exist.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the cam-driven fluid power device which is directly realized by utilizing a mechanical structure, does not need a reversing control system, has the advantages of simple application form structure, reliable action, low failure rate and low production cost, can be applied in a multi-machine combination mode according to requirements, can transmit the power of a power source to a reciprocating mechanism through a transmission mechanism, and can drive a pump set piston rod to reciprocate through the reciprocating mechanism, so that the pumping of fluid can meet the use requirements of customers.
In order to achieve the above purpose, the technical scheme of the invention is to design a cam-driven fluid power device, the device comprises a reciprocating screw and a screw nut in a reciprocating mechanism, wherein the reciprocating screw is provided with a guide groove on the cylindrical surface of a shaft, the guide groove is in sliding fit with a screw slide block, the reciprocating motion of the screw slide block is driven by the rotation of the reciprocating screw, the longitudinal section of the screw slide block is of a T-shaped structure, a vertical block of the T-shaped structure is in sliding fit with the guide groove, a transverse block of the T-shaped structure is in movable fit connection with the screw nut, one side of the screw nut is connected with one end of a piston rod through a connecting rod, the other end of the piston rod is matched with a cylinder body through a piston, and the cylinder body is provided with a fluid inlet and a fluid outlet; two ends of the reciprocating screw rod are respectively supported on the frame, and one end of the reciprocating screw rod is connected with the power source through the transmission part.
In order to drive the screw nut through the screw slider along axial reciprocating motion, simultaneously in order to be convenient for adjust the cooperation elasticity between screw slider and the guide way, preferred technical scheme is, screw nut is the ring piece, screw nut's center be equipped with reciprocal screw complex unthreaded hole, still be equipped with radial hole on the screw nut, radial hole's lower extreme and the cooperation of the horizontal piece of T shape structure, radial hole's middle part is equipped with the spheroid, is equipped with the pressure spring on the spheroid, and the periphery of spheroid and pressure spring is equipped with the sleeve, be equipped with on sleeve and the pressure spring with radial hole screw-thread fit's locking jackscrew.
In order to facilitate the processing and manufacturing of the reciprocating screw rod, the stroke of the guide groove is convenient to replace and the maintenance of the reciprocating screw rod is convenient, the preferable technical scheme is that the reciprocating screw rod is divided into a guide shaft and a driving support shaft, the surface of the guide shaft is provided with the guide groove, the center of the guide shaft is provided with a center hole and a key groove, the driving support shaft penetrates through the center of the guide shaft and is connected with the guide shaft through a connecting key arranged on the driving support shaft, two ends of the guide shaft are provided with check rings, and the check rings are clamped in check ring clamping grooves on the driving support shaft.
In order to facilitate the processing and manufacturing of the reciprocating screw rod, the stroke of the guide groove is convenient to replace and the maintenance of the reciprocating screw rod is convenient, the preferable technical scheme is that the reciprocating screw rod is divided into a guide shaft and a driving support shaft, the guide groove is formed in the surface of the guide shaft, the driving support shaft is connected to the two ends of the guide shaft through a coupler or a plug-in structure, the coupler is a connecting flange, the plug-in structure is that an axial center hole is formed in one end of the driving support shaft, a central shaft matched with the axial center hole is arranged at the two ends of the guide shaft, and the axial center hole is connected with the central shaft through a connecting key or through a radial pin hole and a pin.
In order to facilitate adjustment of the guide travel of the variable guide grooves, a further preferred embodiment provides that the guide shaft is provided with at least two guide grooves in the axial direction, each guide groove guiding a guide travel of the screw slider to be different.
In order to facilitate the formation of good cooperation between the lead screw sliding block and the guide groove and the lead screw nut of the reciprocating lead screw respectively, the preferable technical scheme is that the vertical block of the T-shaped structure is a cylinder or a bearing is arranged on the cylinder, a concave cambered surface matched with the surface of the guide shaft is arranged below the transverse block of the T-shaped structure, and the upper surface of the transverse block of the T-shaped structure is a plane.
In order to facilitate firm connection between the screw nut and the piston rod and smooth operation, the preferred technical scheme is that one side of the screw nut is connected with one end of the piston rod through at least two connecting rods, and the connecting rods penetrate through the frame and then are connected with one end of the piston rod through transverse second connecting rods.
In order to facilitate the connection between the materials and the cylinder body, the materials are conveniently and smoothly conveyed, and the preferable technical scheme is that the cylinder body is connected to the frame through a supporting frame, and the fluid inlet and the fluid outlet are connected with a fluid feeding pipe and a fluid discharging pipe.
In order to facilitate the power transmission of the power source to the reciprocating screw rod to drive the reciprocating screw rod to reciprocate, the preferable technical scheme is that the transmission part comprises a transmission wheel and a transmission belt or a transmission chain, the transmission belt comprises a transmission belt or a transmission synchronous belt, and the transmission wheel comprises a belt wheel, or a synchronous belt wheel or a chain wheel.
In order to improve the conveying efficiency of materials, the preferred technical scheme is that at least two sets of reciprocating screws, screw nuts, piston rods, pistons and cylinder bodies are arranged on a frame, at least two reciprocating screws are connected with a power source through transmission parts respectively, and the power source is at least one of a fuel engine, a motor and a motor.
The invention has the advantages and beneficial effects that: the cam-driven fluid power device is directly realized by utilizing a mechanical structure without a reversing control system, has the advantages of simple structure, reliable action, low failure rate and low production cost, can be used in a multi-machine combination mode according to requirements, can transmit the power of a power source to a reciprocating mechanism through a transmission mechanism, and can drive a pump set piston rod to reciprocate through the reciprocating mechanism, so that the pumping of fluid can be realized, and the use requirement of a customer can be met.
Drawings
FIG. 1 is a schematic view of a linear reciprocating mechanism of the prior art;
FIG. 2 is a schematic cross-sectional view of the prior art linear reciprocating mechanism of FIG. 1;
FIG. 3 is a schematic illustration of the cam driven fluid power plant of the present invention;
FIG. 4 is a schematic cross-sectional view of the reciprocating mechanism in the cam driven fluid power apparatus of the present invention;
FIG. 5 is a schematic illustration of the construction of a three-component cam-driven fluid power plant of the present invention;
fig. 6 is a schematic diagram of a four-component cam-driven fluid power plant of the present invention.
In fig. 3 to 6: 8. a reciprocating mechanism; 81. a reciprocating screw; 811. a guide shaft; 812. driving the support shaft; 82. a guide groove; 83. a screw rod sliding block; 831. a vertical block; 832. a transverse block; 84. a lead screw nut; 841. a radial hole; 842. a spherical body; 843. a pressure spring; 844. a sleeve; 845. locking the jackscrew; 85. a connecting rod; 851. a transverse second link; 86. a piston rod; 87. a cylinder; 88. an inlet for a fluid; 89. an outlet for fluid; 9. a frame; 10. a transmission member; 101. a transmission belt; 102. a driving wheel; 13. a power source; 14. and (5) supporting frames.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings and examples. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
As shown in fig. 3 and 4, the present invention is a cam-driven hydrodynamic device, the device comprises a reciprocating screw rod 81 in a reciprocating mechanism 8, the reciprocating screw rod 81 is provided with a guide groove 82 on the cylindrical surface of a shaft, the guide groove 82 is in sliding fit with a screw rod sliding block 83, the reciprocating movement of the screw rod sliding block 83 is driven by the rotation of the reciprocating screw rod 81, the longitudinal section of the screw rod sliding block 83 is in a T-shaped structure, a vertical block 831 of the T-shaped structure is in sliding fit with the guide groove 82, a transverse block 832 of the T-shaped structure is in movable fit connection with a screw rod nut 84, one side of the screw rod nut 84 is connected with one end of a piston rod 86 through a connecting rod 85, the other end of the piston rod 86 is in fit with a cylinder 87 through a piston, and a fluid inlet 88 and a fluid outlet 89 are arranged on the cylinder 87; both ends of the reciprocating screw 81 are supported on the frame 9, respectively, and one end of the reciprocating screw 81 is connected to the power source 13 through the transmission member 10.
In order to facilitate the axial reciprocating movement of the screw nut driven by the screw slider and facilitate the adjustment of the fit tightness between the screw slider and the guide groove, the preferred embodiment of the present invention is that the screw nut 84 is an annular member, the center of the screw nut 84 is provided with a light hole matched with the reciprocating screw, the screw nut 84 is further provided with a radial hole 841, the lower end of the radial hole 841 is matched with a transverse block 832 of a T-shaped structure, the middle part of the radial hole 841 is provided with a spherical body 842, the spherical body 842 is provided with a pressure spring 843, the peripheries of the spherical body 842 and the pressure spring 843 are provided with a sleeve 844, and the sleeve 844 and the pressure spring 843 are provided with locking jackscrews 845 in threaded fit with the radial hole 841.
In order to facilitate the processing and manufacturing of the reciprocating screw and facilitate the replacement and adjustment of the travel of the guide groove and the maintenance of the reciprocating screw, the preferred embodiment of the present invention further comprises a guide shaft 811 and a driving support shaft 812, wherein the guide shaft 811 is provided with a guide groove 82 on the surface thereof, the center of the guide shaft 811 is provided with a center hole and a key groove, the driving support shaft 812 passes through the center of the guide shaft and is connected with the guide shaft 811 by a connecting key provided on the driving support shaft 812, and the two ends of the guide shaft 811 are provided with a retainer ring which is clamped in a retainer ring clamping groove on the driving support shaft 812.
In order to facilitate the processing and manufacturing of the reciprocating screw and facilitate the replacement and adjustment of the travel of the guide groove and the maintenance of the reciprocating screw, the preferred embodiment of the present invention further comprises that the reciprocating screw 81 is divided into a guide shaft 811 and a driving support shaft 812, the surface of the guide shaft 811 is provided with the guide groove 82, two ends of the guide shaft 811 are connected with the driving support shaft 812 through a coupling or a plug-in structure, the coupling is a connecting flange, one end of the driving support shaft 812 is provided with an axial center hole, two ends of the guide shaft 811 are provided with a center shaft matched with the axial center hole, and the axial center hole is connected with the center shaft through a connecting key or is connected with a pin through a warp-wise pin hole (not shown).
In order to facilitate the adjustment of the guide travel of the change guide grooves, a further preferred embodiment of the invention provides that at least two guide grooves 82 are provided on the guide shaft 811 in the axial direction, each guide groove 82 guiding a different guide travel of the spindle slide. By modulating the lead screw nut 84 and the lead screw slider 83 into different guide grooves 82, the reciprocating travel of the piston rod thereof will be different.
In order to facilitate the good matching between the screw slider and the guide groove and screw nut of the reciprocating screw, the preferred embodiment of the present invention further comprises a vertical block 831 of a T-shaped structure which is a cylinder or a cylinder with a bearing thereon, a concave cambered surface matching with the surface of the guide shaft is provided below a transverse block 832 of the T-shaped structure, and the upper surface of the transverse block 832 of the T-shaped structure is a plane.
In order to facilitate the firm connection between the screw nut and the piston rod and smooth operation, the preferred embodiment of the present invention also has one side of the screw nut 84 connected to one end of the piston rod 86 through at least two connecting rods 85, and the connecting rods 85 are connected to one end of the piston rod 86 through a transverse second connecting rod 851 after passing through the frame 9.
In order to facilitate the connection between the material and the cylinder and the smooth transportation of the material, the cylinder 87 is connected to the frame 9 through the support frame 5, and the fluid inlet 88 and the fluid outlet 89 are connected with the fluid feeding pipe and the fluid discharging pipe.
In order to facilitate the transmission of the power source to the reciprocating screw to drive the reciprocating movement of the piston rod, the preferred embodiment of the present invention also comprises a transmission belt 101 and a transmission wheel 102 or a transmission chain, wherein the transmission belt 101 comprises a transmission belt or a transmission synchronous belt, and the transmission wheel 102 comprises a belt pulley, or a synchronous belt pulley, or a chain wheel.
As shown in fig. 5 and 6, in order to improve the conveying efficiency of the materials, the preferred embodiment of the present invention further includes at least two sets of reciprocating screw rods 81, screw nut 84, piston rod 86, piston and cylinder 87, which are respectively disposed on the frame 9, at least two reciprocating screw rods 81 are respectively connected with a power source 13 through a transmission component 10, and the power source 13 is at least one of a fuel engine, an electric motor and a motor.
The action principle of the cam-driven hydrodynamic device of the invention is as follows:
the power source such as the output shaft of motor, through band pulley, drive belt drive reciprocating screw rotation, reciprocating screw is provided with along the guide way of face of cylinder be space curve groove, namely a cam groove, cam groove and lead screw slider sliding fit, the cross-section of lead screw slider is T shape structure, the lower extreme and the guide way sliding fit of T shape structure, the upper end and the screw nut movable fit of T shape structure are connected, consequently reciprocating screw's rotation can drive screw nut's reciprocating motion, one side of screw nut passes through the one end of connecting rod connection piston rod, the piston of the piston rod other end can be in the cylinder body reciprocating motion, just can inhale the fluid from the feed inlet of cylinder body through the reciprocating motion of piston rod in the cylinder body, then discharge by the bin outlet of cylinder body. In order to improve the efficiency of fluid material delivery, multiple sets of reciprocating mechanisms can be mounted on the frame side by side, as shown in fig. 5 and 6.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (9)
1. The cam-driven fluid power device is characterized by comprising a reciprocating screw rod and a screw rod nut in a reciprocating mechanism, wherein one side of the screw rod nut is connected with one end of a piston rod, and the other end of the piston rod is matched with a cylinder body; two ends of the reciprocating screw rod are respectively supported on the frame, and one end of the reciprocating screw rod is connected with a power source through a transmission part;
the screw nut is an annular piece, the center of the screw nut is provided with a light hole matched with the reciprocating screw, the screw nut is also provided with a radial hole, the lower end of the radial hole is matched with a transverse block of a T-shaped structure, the middle part of the radial hole is provided with a spherical body, the spherical body is provided with a pressure spring, the peripheries of the spherical body and the pressure spring are provided with a sleeve, and the sleeve and the pressure spring are provided with locking jackscrews in threaded fit with the radial hole;
the reciprocating screw rod is divided into a guide shaft and a driving support shaft, a guide groove is formed in the surface of the guide shaft, a center hole and a key groove are formed in the center of the guide shaft, the driving support shaft penetrates through the center of the guide shaft and is connected with the guide shaft through a connecting key arranged on the driving support shaft, check rings are arranged at two ends of the guide shaft, and the check rings are clamped in check ring clamping grooves on the driving support shaft.
2. The cam-driven fluid power apparatus as claimed in claim 1, wherein at least two guide grooves are provided on the guide shaft in the axial direction, and a guide stroke of each guide groove for guiding the lead screw slider is different.
3. The cam-driven fluid power device of claim 1, wherein the vertical block of the T-shaped structure is a cylinder or a bearing is arranged on the cylinder, a concave cambered surface matched with the surface of the guide shaft is arranged below the transverse block of the T-shaped structure, and the upper surface of the transverse block of the T-shaped structure is a plane.
4. The cam driven fluid power apparatus of claim 1, wherein one side of the lead screw nut is connected to one end of the piston rod through at least two links, and the links pass through the frame and are connected to one end of the piston rod through a transverse second link.
5. The cam driven fluid power plant of claim 1 wherein the cylinder is connected to the frame by a support frame, the cylinder having a fluid inlet and a fluid outlet, the fluid inlet and the fluid outlet being connected to a fluid feed line and a fluid discharge line.
6. The cam-driven fluid power device of claim 1, wherein the transmission member comprises a transmission wheel and a transmission belt or chain, the transmission belt comprising a transmission belt or belt timing, the transmission wheel comprising a pulley, or a timing pulley, or a sprocket.
7. The cam-driven fluid power device according to claim 1, wherein at least two sets of reciprocating screw rods, screw nut, piston rod, piston and cylinder are respectively arranged on the frame, at least two reciprocating screw rods are respectively connected with a power source through a transmission part, and the power source is at least one of a fuel engine, an electric motor and a motor.
8. The cam-driven fluid power device is characterized by comprising a reciprocating screw rod and a screw rod nut in a reciprocating mechanism, wherein one side of the screw rod nut is connected with one end of a piston rod, and the other end of the piston rod is matched with a cylinder body; two ends of the reciprocating screw rod are respectively supported on the frame, and one end of the reciprocating screw rod is connected with a power source through a transmission part;
the screw nut is an annular piece, the center of the screw nut is provided with a light hole matched with the reciprocating screw, the screw nut is also provided with a radial hole, the lower end of the radial hole is matched with a transverse block of a T-shaped structure, the middle part of the radial hole is provided with a spherical body, the spherical body is provided with a pressure spring, the peripheries of the spherical body and the pressure spring are provided with a sleeve, and the sleeve and the pressure spring are provided with locking jackscrews in threaded fit with the radial hole;
the reciprocating screw rod is divided into a guide shaft and a driving support shaft, a guide groove is formed in the surface of the guide shaft, the driving support shaft is connected to the two ends of the guide shaft through a coupler or an inserting structure, the coupler is a connecting flange, an axial center hole is formed in one end of the driving support shaft through the inserting structure, a central shaft matched with the axial center hole is arranged at the two ends of the guide shaft, and the axial center hole is connected with the central shaft through a connecting key or through a warp-direction pin hole and a pin.
9. The cam-driven fluid power apparatus as claimed in claim 2, wherein at least two guide grooves are provided on the guide shaft in the axial direction, and a guide stroke of each guide groove guiding the lead screw slider is different.
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| CN201710915916.3A CN107476947B (en) | 2017-09-30 | 2017-09-30 | Cam-driven fluid power device |
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| CN201710915916.3A CN107476947B (en) | 2017-09-30 | 2017-09-30 | Cam-driven fluid power device |
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| CN107476947B true CN107476947B (en) | 2023-06-09 |
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| Title |
|---|
| 刘仲梅 ; .差速丝杠机构.机械制造.-,1900,第-卷(第08期),22-23. * |
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